package com.zhangshitong.util;

import java.util.Date;
import java.util.Random;

public class PasswordUtil {

	public final static String[] word = {
        "a", "b", "c", "d", "e", "f", "g",
        "h", "j", "k", "m", "n",
        "p", "q", "r", "s", "t",
        "u", "v", "w", "x", "y", "z",
        "A", "B", "C", "D", "E", "F", "G",
        "H", "J", "K", "M", "N",
        "P", "Q", "R", "S", "T",
        "U", "V", "W", "X", "Y", "Z"
	};

	public final static String[] num = {
        "2", "3", "4", "5", "6", "7", "8", "9"
	};

	public static String randomPassword() {
    StringBuffer stringBuffer = new StringBuffer();
    Random random = new Random(new Date().getTime());
    boolean flag = false;
    int length = random.nextInt(3) + 8;
    for (int i = 0; i < length; i++) {
        if (flag) {
            stringBuffer.append(num[random.nextInt(num.length)]);
        } else {
            stringBuffer.append(word[random.nextInt(word.length)]);
        }
        flag = !flag;
    	}
    return stringBuffer.toString();
	}

	public static void main(String[] args) throws Exception {
		System.out.println(randomPassword());
		Thread.sleep(100);
		System.out.println(randomPassword());
		Thread.sleep(100);
		System.out.println(randomPassword());
	}
}
